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数据( Data )是描述事物的符号记录,是指利用物理符号记录下来的、可以鉴别的信息。
数据是信息存在的一种形式,只有通过解释或处理的数据才能成为有用的信息。
数据库( Database , DB )是指长期储存在计算机中的有组织的、可共享的数据集合。
数据要按照一定的数据模型组织、描述和存储,具有较小的冗余度、较高的数据独立性,系统易于扩展,并可以被多个用户分享。
数据库中存储的数据的三个基本特点(识记):永久存储、有组织、可共享。
数据库管理系统( DBMS )是专门用于建立和管理数据库的一套软件,介于应用程序和操作系统之间。
数据库管理系统及其功能(识记)
数据独立:数据定义与使用数据的应用程序分离。
实施统一管理与控制主要包括:数据的安全性、完整性、并发控制、与故障恢复等,即数据库保护。
三级模式结构的两层映像与数据独立性
模型( Model )是现实世界特征的模拟和抽象表达。
数据模型是对现实世界数据特征的抽象,描述的是数据的1.共性内容。
静态特征
动态特征指对数据可以进行符合一定规则的操作。
数据模型组成要素
数据结构描述的是系统的静态特征,即数据对象的数据类型、内容、属性以及数据对象之间的联系。
数据操作描述的是系统的动态特征
数据约束描述数据结构中数据间的语法和语义关联
数据模型是模型化数据和信息的工具,也是数据库系统的核心和基础
信息世界涉及的基本概念
实体( Entity )
属性( Attribute )
码或键(Key)
域( Domain )
实体型( Entity Type )
实体集( Entity Set )
联系( Relationship)
数据模型中有“型”( type )和"值”( value )两个概念。
逻辑层是数据抽象级别的中间层。
22.
关系数据模型的组成要素
关系的三种类型
码或键(Key)
超码或超键( Super Key )在码中去除某个属性,它仍然是这个关系的码
候选码或候选键( Candidate Key )
主属性( Primary Attribute )或非主属性( Nonprimary Attribute )
主码或主键( Primary Key )
全码或全键( All Key )
外码或外键( Foreign Key )
参照关系( Referencing Relation )和被参照关系( Referenced Relation )
域( Domain )
数据类型( Data Type )
关系模式( Relation Schema )
关系数据库( Relation Database )
关系数据库对关系的限定/要求:
1 )每一个属性都是不可分解的(不允许表中有表) ;
2 )每一个关系仅仅有一种关系模式;
3 )每一个关系模式中的属性必须命名,属性名不同;
4 )同一个关系中不允许出现候选码或候选键值完全相同的元组;
5 )在关系中元组的顺序(即行序)是无关紧要的,可以任意交换;
6 )在关系中属性的顺序(即列序)是无关紧要的,可以任意交换。
基本的关系操作
基本的关系操作
关系模式中可能存在的冗余和异常问题
数据冗余
更新异常
插入异常
删除异常
即码
即候选码
即超码
一个低一级范式的关系模式通过模式分解(Schema Decomposition)可以转换为若干个高一级范式的关系模式的集合,这种过程就叫规范化( Normalization)。
数据库设计的目的
数据库设计的内容
数据库设计的方法
直观设计法
规范设计法
计算机辅助设计法
数据库设计的功能
独立于任何软件与硬件
主要目标:最大限度的满足应用需求
数据库实施
Temporary 临时表
alter table mysql_test.customers
change column cust_city cust_city char(10) not null default 'Wuhan';
alter table mysql_test.customers
alter column cust_city set default '北京';
alter table mysql_test.customers
modify column cust_name char(20) first;
alter table mysql_test.customers
drop column cust_contact;
alter table mysql_test.customers
rename to mysql_test.cust;
rename table mysql_test.cust to mysql_test.customers;
create index index_cust
on mysql_test.customers(cust_name, cust_id);
create table seller(
seller_id int not null,
seller_name char(50) not null,
seller_address char(50) null,
seller_contact char(50) null,
product_type int(5) not null,
sales int null,
primary key(seller_id, product_type),
index month_sales(sales)
);
alter table mysql_test.seller
add index index_seller_name(seller_name);
show index in mysql_test.seller;
drop index index_seller_name on mysql_test.seller;
alter table mysql_test.seller
drop index month_sales;
insert into mysql_test.customers values(
'张三',901, 'F', '北京', '朝阳'
);
insert into mysql_test.customers values
('sun', 902,'F','北京','海淀'),
('mooth', 903, 'M', '上海', '浦东');
insert into mysql_test.customers values
('李四', 0, default, '武汉', NULL);
insert into mysql_test.customers (cust_name,cust_address)
values
('李四', '武汉');
insert into mysql_test.customers set cust_name='lisi',cust_city='wuhan',sex=default;
delete from mysql_test.customers where cust_name = '李四';
update mysql_test.customers set cust_address='武汉市' where cust_name='张三';
select cust_name, cust_sex,cust_address from mysql_test.customers;;
select * from mysql_test.customers;
select cust_address as '地址' from mysql_test.customers;
select cust_name, case when cust_sex = 'M' then '男' else '女' end as sex from mysql_test.customers;
select cust_name, cust_sex, cust_id + 100 from mysql_test.customers;
select * from mysql_test.customers where cust_sex = 'M';
select * from mysql_test.customers where cust_id between 901 and 912;
select * from mysql_test.customers where cust_id in (901, 902, 906);
视图是数据库中的一个对象,它是数据库管理系统提供给用户的以多种角度观察数据库中数据的一-种重要机制。
视图不是数据库中真实的表,而是一-张虚拟表,其自身并不存储数据
create or replace view customers_view
as select * from mysql_test.customers
where cust_sex = 'M'
with check option;
insert into customers_view values(
'周明', 909, 'M', '武汉市', '洪山区');
update mysql_test.customers_view set cust_address = '上海';
delete from mysql_test.customers_view where cust_name='周明';
select cust_name, cust_address from mysql_test.customers_view where cust_id = 905;
存储过程是一组为了完成某项特定功能的SQL语句集
其实质就是一段存储在数据库中的代码。
它可以由声明式的sq|语句和过程式sq|语句组成。
use mysql_test;
mysql> delimiter $$
create procedure sp_update_sex(in cid int, in csex char(1))
begin
update customers set cust_sex=csex where cust_id=cid;
end $$
call sp_update_sex(901, 'M');
drop procedure if exists sp_update_sex;
1)只能在存储过程体的BEGIN…END语句块中声明;
2)必须在存储过程的开头处声明;
3)作用范围仅限于声明它的BEGIN…END语句块;
4)不同于用户变量
局部变量与用户变量的区别:
1)局部变量声明时,在其前面没有@符号,并且它只能
被声明它的BEGIN… END语句块中的语句所使用;
2)用户变量在声明时,会在其名称前面使用@符号,同
时已声明的用户变量存在于整个会话之中。
create function fn_search(cid int)
returns char(20)
deterministic
begin
declare sex char(20);
select cust_sex into sex from customers where cust_id=cid;
if sex is null
then return (select '没有客户');
else if sex='F' then return (select '女');
else return('男');
end if;
end if;
end$$
create function fn_address(cid int)
returns char(20)
deterministic
begin
declare name char(20);
declare address char(20);
select cust_name into name from customers where cust_id = cid;
select cust_address into address from customers where cust_id = cid;
if name is null then return (select '
没有名字');
end if;
if addrress is null then return (select '没有地址');
end if;
return name + ': ' + address;
end$$
默认restrict。
没有指定名字mysql会自动给一个。
create trigger customers_insert_trigger after insert
on customers for each row set @str='one customer added';
insert into customers values ( '万宁', NULL, 'F','长沙','芙蓉区');
create trigger cutomers_update_trigger before update on customers for each row set new.cust_address = old.cust_city;
数据库的安全性是指保护数据库以防止不合法的使用而造成数据泄露、更改或破坏,所以安全性对于任何一个DBMS来说都是至关重要的。
select user from mysql.user;
create user 'zhangsan'@'localhost' identified by '123';
drop user 'zhangsan'@'localhost';
rename user 'zhangsan'@'localhost' to 'li'@'localhost';
set password for 'li'@'localhost' = '456';
grant
select(cust_id,cust_name)
on mysql_test.customers to 'li'@'localhost'
with grant option;
revoke
select(cust_name)
on mysql_test.customers
from 'lisi'@'localhost';
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[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-DsuZD9rV-1649146526393)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331200714076.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-0VILA7kQ-1649146526393)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331200739286.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-DnWgfTjJ-1649146526394)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331200816558.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Zghr9dYE-1649146526394)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331200828517.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-n89ICEmL-1649146526395)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331200849986.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-wGQnNaAq-1649146526395)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331200859344.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-y3LV2L2g-1649146526395)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201028865.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-1LX7UDGF-1649146526396)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201112082.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-3iqF6V51-1649146526396)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201211033.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-kmDasuIp-1649146526397)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201255794.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-pMkfXQRH-1649146526397)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201336986.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-G92EWkwM-1649146526397)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201514820.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-z0Zu0pPo-1649146526398)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331201857330.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-fb7KuCFq-1649146526398)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202006334.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-vr1QgFBu-1649146526399)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202025785.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Wr9S5n1r-1649146526399)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202036637.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-VPKzD9k0-1649146526399)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202111627.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-BR3OVHzj-1649146526400)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202130490.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-j3mKmBWJ-1649146526400)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202148765.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-mznyjXOR-1649146526401)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202200856.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-KdLGJRhS-1649146526401)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202344585.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-i7OIoJRq-1649146526401)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202355706.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-7ZrCfbBk-1649146526402)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202533324.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-yCO7oOl7-1649146526402)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202731736.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-oJ5f2P6l-1649146526403)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202801767.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QR28xTcz-1649146526403)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331202815464.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-JSqeKTom-1649146526404)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231219159.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-RVNww6QP-1649146526404)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231245027.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-k8Gyi0q3-1649146526404)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231257859.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Qm3oDOmm-1649146526405)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231318523.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-BRJDKMMf-1649146526405)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231407316.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-WjxNiwGt-1649146526406)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231443443.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-1PXLbVUW-1649146526406)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231546166.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QxPAs4bI-1649146526406)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231704267.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-4pGPfCCZ-1649146526407)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231853879.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-1LlGh6Az-1649146526407)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331231944877.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Y1Bt6zNy-1649146526408)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232021454.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-brmW2lSI-1649146526408)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232528534.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-YeqNTQFe-1649146526408)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232555480.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-B8cos83V-1649146526409)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232612820.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-FrEP3cjW-1649146526409)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232629692.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-TNHBYW1f-1649146526409)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232717254.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-9NKZ7Akc-1649146526410)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232740990.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-EF7HnDRd-1649146526410)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232805416.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QainCcQI-1649146526411)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232819789.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-uXtbHP8l-1649146526411)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232923407.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-pS6H6TPE-1649146526411)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331232958954.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-NTyAQVAS-1649146526412)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331233039006.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-JgKprN3k-1649146526412)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331233707171.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-2eldLmR4-1649146526412)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331234935639.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-auwXWSjU-1649146526413)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331234949347.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-mGN2VecK-1649146526413)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235022776.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-N2ONsbXK-1649146526414)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235038119.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-XaW8cIm0-1649146526414)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235123278.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-BMfHOihs-1649146526414)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235255601.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-MrlOL9CN-1649146526415)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235332210.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-6hBYPqFJ-1649146526416)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235546904.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Fx16TcQq-1649146526416)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235608306.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-mlv6gSsp-1649146526416)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235635372.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hOpQHdNz-1649146526417)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235649878.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-YaLTLW9H-1649146526417)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235803265.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-qPmD1dfc-1649146526418)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235827414.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hvqftnuq-1649146526418)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235900049.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Pwknfp5H-1649146526419)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220331235919932.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-E7KCyQ0h-1649146526419)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000340210.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-9Orj6QSk-1649146526419)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000437303.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-SQTJMdox-1649146526420)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000456140.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-HQHH27Jv-1649146526420)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000511445.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-azshU9oo-1649146526420)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000522502.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-8ZEW8lW5-1649146526421)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000548038.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-iEsJMnRR-1649146526421)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000647656.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-xEed983N-1649146526422)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000913592.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Y3Py6V7I-1649146526422)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000946282.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GWh7Y5Ws-1649146526422)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401000956746.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-z9reILZo-1649146526423)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401001008503.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-CRFn4mSD-1649146526423)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401001024793.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-blv3pqj1-1649146526424)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192024509.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-lOHf06vW-1649146526424)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192033428.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-x7YW9Ik4-1649146526424)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192208071.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-CrClVZdd-1649146526425)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192222235.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-5cjlxHNM-1649146526425)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192508472.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-SE79tPVB-1649146526426)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192550948.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-DhQgZ3eS-1649146526426)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192603571.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-vOHZQ5Uv-1649146526426)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192739116.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-4X3KWWJi-1649146526427)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192749272.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-96pODKmV-1649146526427)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192848312.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-JDa3fQfl-1649146526427)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192915720.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-r6McpErK-1649146526428)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401192937472.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-IQV9syFe-1649146526428)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401193827213.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-zOHgdNnq-1649146526429)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401194500710.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ck9PXqkb-1649146526429)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401194527073.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-j8UDB2AX-1649146526429)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401194549439.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-1PIy7LiY-1649146526430)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401194642715.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GkuxwtSN-1649146526430)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401194812722.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-jRaJVpcb-1649146526431)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401194947699.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-6DVcTEQl-1649146526431)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195218843.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hMATDwZz-1649146526431)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195303934.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-wXU9Q4nq-1649146526432)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195333734.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-0jP2mXlo-1649146526432)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195411793.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-37Xb9S40-1649146526433)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195423568.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-afQBHFai-1649146526433)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195453887.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-DmFlXlZG-1649146526433)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195502835.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-VIx2Jv58-1649146526434)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195518865.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-IVhcvLUD-1649146526434)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195623119.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-7Gtgy3MT-1649146526435)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195634750.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GkUaVia3-1649146526435)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195842776.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-gd7Y27oS-1649146526435)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401195858882.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GT3gXFs4-1649146526436)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200004618.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-cniHm8z0-1649146526436)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200034157.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-XCvvbgW5-1649146526437)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200044428.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-xG8n5NPT-1649146526437)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200231830.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-dZFvM3Im-1649146526437)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200241595.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-sONtzZaN-1649146526438)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200313893.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Gk60eGF5-1649146526438)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401200333400.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-L4yVR13o-1649146526439)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201035395.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Z8YsBNx6-1649146526439)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201049263.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-KmX82bpv-1649146526439)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201143886.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-cRo9Qg7f-1649146526440)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201159543.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-1lPMGntl-1649146526440)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201214125.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-d0vhYVwv-1649146526441)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201225216.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Dknswn9h-1649146526441)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201502757.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-V3zS3jp2-1649146526441)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201524643.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Qo8Jzb9T-1649146526442)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201536897.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-9fC2VNRF-1649146526442)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201605991.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GKTeWr7o-1649146526443)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201617197.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-K3BRgU2A-1649146526443)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201626219.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Mb8ofDri-1649146526443)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201635763.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-9SzKGNzX-1649146526444)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201646615.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Ghikj083-1649146526444)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201656249.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-B7NjXF9a-1649146526444)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201722025.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-waEVawP6-1649146526445)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201756009.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QgeYQlFn-1649146526445)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201836306.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Yy8jDTyN-1649146526446)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201845289.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-m7tH3m1x-1649146526446)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401201932200.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-8ScU5mLP-1649146526446)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202027583.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-aCFXbAii-1649146526447)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202035849.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-aRSAjCxG-1649146526447)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202047600.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-fReb4K3d-1649146526448)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202056397.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-P6Idn6Ub-1649146526448)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202108754.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-qdlf6uY0-1649146526448)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202122323.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-FHJxhapr-1649146526449)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202156089.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-4QPCPEAZ-1649146526449)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202208519.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-aZN5BhEq-1649146526449)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202222911.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-TZPFiQEd-1649146526450)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202232039.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-2J16fGZP-1649146526450)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202250791.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-vZ79KtCD-1649146526451)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202430328.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-H96YzOY1-1649146526451)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202453815.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-PwTHfiZi-1649146526451)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202529514.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ebxVPEcK-1649146526452)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202733304.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-33mLXYS4-1649146526452)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202808648.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-NVzN5xgf-1649146526452)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202850833.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-0pmzxiLi-1649146526453)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202901146.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hLasrrdp-1649146526453)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401202911105.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-mpQLTd1E-1649146526454)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401203012230.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-7ti5hZfp-1649146526454)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401203025640.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-TglRNNeL-1649146526454)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401203041528.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-pfcWl3aw-1649146526455)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401203206728.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-nTu8mtPH-1649146526455)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401203230920.png)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-UqugsHmE-1649146526455)(/Users/chanzj/Library/Application Support/typora-user-images/image-20220401203248021.png)]
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